No, you haven't. Look at the video footage by clicking on the title to this post. Why bother to have security footage at all if it looks this fuzzy? If you really want to secure your property, how about video footage of high quality?
This is not a slam at WalMart. I see it all the time on the news. Some grainy footage of a crime in progress, and no one could possibly recognize who it might have been. If you want to really prevent crime, get some quality cameras in there.